This photo shows the types of fireworks purchased Sunday, May 4, 2014 by Darrin Campbell, according to the Phantom Fireworks store in Tampa, Florida. Campbell and his family were found dead inside a burned-down million-dollar home owned by former tennis professional James Blake in Florida, days after the fireworks were purchased. Authorities have called the fire arson, but have not said what role, if any, the fireworks played in the blaze. (Photo: Tamara Lush, AP)

The Campbell's home, decorated for Christmas. The Campbells - largely through son Colin's urging - won WOW's Holiday Decorating Contest (best individual home) for four years straight from 2008-2011. The neighborhood would leave the gates open the weekend before Christmas and the family, in 2009, began collecting contributions from visitors. In December 2009, they presented a check to Metropolitan Ministries for $3,733 from the donations. (Photo: Teresa Trubilla and World of Westchase)

James Blake during a 2013 match against Jerzy Janowicz (POL) at the Western & Southern Open at the Lindner Family Tennis Center. Blake's million dollar Tampa home went up in flames Wednesday morning, with two people found dead inside. A spokesperson with the James Blake Foundation confirms he was not in the home at the time. (Photo: Pat Lovell, USA TODAY Sports)

The Tampa Bay Times reports Mary Catherine Campbell filed paperwork in Hillsborough County probate court on June 6. She says she's the only surviving heir to her son's estate.

Authorities say 49-year-old Darrin Campbell set off $600 of fireworks in the $1.6 million home he was renting from retired tennis player James Blake in the early morning hours of May 7. The bodies of Campbell, his 51-year-old wife Kimberly, 18-year-old Collin and 16-year-old Megan were found inside.

In the court documents, Mary Campbell appointed her son Dale as her representative.